"We still have potentially very rough times ahead."

After a brave little boy named Seth asked for support before a big surgery, the Internet rallied around him, wearing yellow and spreading their photos on social media. Seth, whose immune disorder has him living in a "bubble" at a hospital, sparked an inspirational campaign around the #WearYellowForSeth hashtag.

Now, Seth has finally received the bone marrow transplant that could potentially treat his severe combined immunodeficiency disorder, or SCID. Originally he was supposed to get the procedure done on March 27, when everyone wore yellow for him, but health complications delayed the procedure.

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Seth's father had his bone marrow cells harvested, which were then transplanted into Seth's body on May 1. Seth has responded pretty well to the procedure, but is having problems with his kidneys and maintaining his body temperature.

"He is OK, he is doing better than had expected so I am struggling to stay realistic," his mother wrote in a blog post. "We still have potentially very rough times ahead. Nothing has changed in terms of risks and expectations, but he is not critically ill which is what I had prepared myself for."

The cells have been transplanted, but they haven't started working yet, so Seth still has no immune system. Ideally, the new white blood cells in his body will start working in a little over a week. But the little one is staying positive. "Seth says that Daddy's magic is still finding its home, so he will feel better soon," his mom wrote.